Power lift plow



July 3, 1928. 1,675,433

j c. G. STRANDLUND POWER LIFT PLOW Original Filed Oct. 1, 1923 2 Sheets-Sheet 1 July 3, 1928. 1,675,433

C. G. STRANDLUND POWER LIFT PLOW ori inal Filed Oct. 1, 1925 2 spans-sheet 2 Patented July 3, 1928.

a 1,675,433 PATENT OFFICE.

R G S BANDPW 9? 11 ewes sesifiwfi P DEERE & COMPANY, 01*

" "129? 'I NWE 9 39 .ILUNOIS- rowan ,LIr'r rLow.

App ion filcd petober 1, lees smal No; 665,897. Renewed April 17, 1926.

, My invention relates to wheeled plows and more particularly to; that type .in which traction power utilized togliftthefplow outof operation, and, the object offiliy. in- Vent-ion is to. provide means operative to add to therpower employed iniraising theplow and to. exert an assisting force. in the: initial lowering movement of the plow.

, Referring to the drawingsin which similar numerals indicate. identicalparts-e Figure 1 is a plan view ofxa wheeled. plow embodying/my improvement. Figure 2 ,,is' .a sideelevation of Figure 1 with ,the ow raised,and Fim re 3 is anrenlarged tragmentary View illustrating the. operatiiie pos'ition'ol my improvement whenithe plow is down." it a Y a 1' The type of plow ShQWllnlS more clearly illnstratedt and described in i a fpendin 'oint application," Serial No. 393,823, hid alo'y TheophilusBrown and? myself, to which reterence is-made for a more complete descrip= tion, and for which purposeTlemp1o'y .similar numerals indicating the parts 1 in this application believednecessarywto sliowrmy improvement and itsoperationl wiEhe plow, in this :instance, inclndes beams *+10 and \11 spacedtandl secured rigidlly; t g fi y braces 12, .13, and 14. 1 Plowsbodiesilfi are no moiinted onthe beans 10 and 11,;and on;t he forward ends otthe latter" are clevises '16 by which the beams are connected to a transverse bar 17 adapted to be attached to a tractor bysuitable links 18.1 IFhe beams .10 and 11 which, with the braces12, 13 a11dt14, constitute the frame of the'plow, are sup- )orted on a transverse aXle28 thehorn zontal portion of which is supportedin'bearings 20 and 21secured respectively on the beams 10 1and 11 thatiitmay rockabont awtransyerse axis. The axle 28 llS; bent to present depending portionsfor arms 29 and 30, which terminateilin horizontal: spindles 31 and 36 upon-which are jolirnaled respectively a' land wheel-32 and a furrow wheel37. 1

The mechanism for lifting the plow .1 is actuated by the traction pdwer of a the land when "conveyed through a cljn'tch adaptedtr') be tripped'into activity by the' operator to raise the plow, and releasedto lower the plow, both operations being 'ftnlly "described in the -application aboi'e' cited. I'd'o not, however, limit myself to the particular inechanism therein described as *my impr vewent canbe readily applied to plows having a d fierent type of raising and lowering V me hanism with equal efliciency in operation;

Securedonthe axle 28, at the bendbetween its horizontal portion andthe arm 29, by clamps 49, is a casting 48, having integraltherewith an eye 50 whichprojects forwardly from the casting and in which 1 is hooked an end of a coiled spring 51. flhe opposite ,end, of the spring 51 extends through a hole in a bracket 52, mounted formerrily; on the beam .11, .and is secured in placer y a not, the end otthe ispringbeing threaded for thatpurpose and also for-the purpose of varying the tension of the spring-n1. r A ,1

As stated, the plow is raisedrhyvtheatracrtionpilwerottheiland wheel which, at the l will of the operator, is utilized to swing the horizontal portionof the axle 2B npongthe arms 29, 30 upward and forwardabontthe wheel axes wherebythe frame israised and the'plow bodies elevated above the ground; this operation is assisted by the spring ,51 which isiat its reatest tensien i'srhenithe plow is; down and the parts areinitheposition shown inFigure 3, for asthe springihl is connectedto the eye 50 whiclh whenithc plow is down, isabovetheaxi's of the axle 28, it is evident considerable force is added tothe tractionipower of'ithe land wheeluto raise theiplow. As the plow rises the eye 50 swings 'forward, or toward the front end connection of the spring 51, which conse 'qnently contracts, until when said eye is'oarried into alinement with'a lineintersecting the point ofconnection of the-spring to the beam 11 andthehorizontal axis of the axle 28 the lifting tendency of the springceases. From this point on the traction power" of the land wheel 32 is suliicientto complete theoperatio'n. a

As the :lifting movement'of the axle2 8 continues theeye 50moves downward and away from the front end connection ofthe springtl, so that said spring :is zigaintextendednntil the plow has been raised to its limit above the ground, and the mechanism operatesjto hdld-the plow in this position.

Thet'orce of the is pringol is now: pulling to thehorizontal' portion of the axle 28 uponthe'arlns 29, downward and rearwa rd'abo nt the wheelfa'xes, thereby loweriri the-frame, which spring action Lhave fonnd is very desirable when the mechanism is tripped to lower the plow by gravity, for it is evident that, as the plow is fixed to the tractor, when the axle 28 has been rocked in lifting the plow until the arm 29 is at a forward angle to a vertical line throu 'h the axis of the horizontal part of the axle, and the arm 30 is at a slightly rearward angle to said line, the weight of the plow tends to prevent a rapid lowering movement of the axle when the plow has been released to drop to the ground; and I overcome this tendency by means of the spring 51, which when the plow is fully raised exerts its tension to swing the axle in a direction to lower the plow.

lVhat I claim is- 1. In a wheeled plow, the combination of a beam structure, a wheeled support movable to lift or lower the plow, mechanism actuated by power of the traction to move said support to lift the plow, and means connected with the beam structure and with said support, and cooperating with said mechanism to increase the power thereof as the plow rises and operating to resist said power as the plow approaches its pro-determined height.

2. In a wheeled plow, the combination of a beam structure, a wheeled support movable to lift or lower the plow, mechanism actuated by power of the traction to move said support to lift the plow, and a coiled spring connected with the beam structure and with said support, and cooperating with K said mechanism to increase the power thereof as the plow rises and operating to resist said power as the plow approaches its predetermined height.

3. In a wheeled plow having a. rockable crank axle and supporting wheels, the combination with mechanism actuated by power of the traction to rock said axle and raise the plow, of means connected to the plow and the axle and cooperating with said mechanism to increase the power thereof for a limited time as the axle 1s rocked and the plow rises, said means resisting said power as the plow approaches its pre-determined height. 7

4. In a wheeled plow having a frame, a rockable crank axle and supporting wheels, the combination with mechanism actuated by power of the traction to rock said axle and raise the plow, of a coiled spring con nected to the frame and the axle and cooperating with said mechanism to increase the power thereof for a limited time as the axle 1s rocked and the plow rises, said spring resisting said ower as the plow approaches its pre-determmed height.

5. In a wheeled plow having a frame, a rockable crank-axle and supporting wheels, the combination with mechanism to rock said axle and raise the plow, of a coiled spring connected to the frame and to a projection fixed on the axle and movable therewith, said spring cooperating with said mechanism to rock said axle to raise the plow, the tension of said spring being affected only by the raising and lowering of the plow, and being greatest when the plow is in operation, diminishing as the plow rises from its operative position and increasing as the plow in rising approaches a predetermined height.

6. In a power lift plow, the combination of a beam structure, a wheeled support movable to lift or lower the plow, mechanism operable to move said support to raise the plow, and means connected with the beam structure and with said support, and cooperating with said mechanism to increase the power thereof as the plow rises and resisting said power as the plow approaches its pro-determined height.

7. In a wheeled plow, the combination with a beam structure, a wheeled support movable to lift or lower the plow, mechanism for moving said support to lift the plow from operative to transport position, of means connected with the beam structure and with said support and controlled by upward movement of the plow, to initially supplement the lifting power and then .to resist such lifting power.

8.1m a wheeled plow, the combination with a beam structure, a wheeled support movable to lift or lower the plow, power actuated mechanism for moving said support to lift the plow from operative to transport position, of means connected with the beam structure and with said support and operating initially in the lifting operation to supp ement the lifting power, and, when the plow is in its transport position, acting ,to. apply lowering power to the plow.

9. In a wheeled plow, the combination with a beam structure, a wheeled support movable to lift or lower the plow, power actuated mechanism for moving said sup port to lift the plow from operative to transport position, of a sprin connected with the beam structure and wit said support, and initially cooperating with said mechanism to lift the plow, and operating to apply lowering power to said mechanism when the plow is in its transport position. v

10. In a wheeled plow, the combination with aplow bod carrying frame, an axle supporting said rame and having a swinging arm rovided with a wheel spindle, and a groun wheel mounted on said spindle, whereby the plow may be raised or lowered by swinging said arm, of mechanism for applying tractive power to swing said arm to lift the plow, and means connected with the frame and with said axle and initially coacting with the tract-ive ower to swing the axle to lift the plow, and tending when the plow reaches a predetermined height, to swing the axle in the opposite direction, to lower the plow. i H

11. In a wheeled plow, the combination with a plow body carrying frame, an axle supporting said frame and having a swing ing arm provided with a wheel spindle, and a ground wheel mounted onsaid spindle, whereby the plow may be raised or lowered by swinging said arm, of mechanism for applying tractive power to swing said arm to lift the plow, and a spring connected with a the frame and with said axle and movable by the swinging of said axle from a position to apply lifting force thereto to a position to apply lowering force thereto. I a

12. In a wheeled plow, the combination with a plow body carrying frame, an axle supporting said frame and having a swinging arm rovided with a wheel spindle, and a gronn wheel mounted on said spindle,

whereby the plow may be raised or lowered the spring being movable by the swinging of the axle in lifting the plow, from one side to the other of a line intersecting the axis of the axle and the connection of said spring with the frame.

- CARL G. STRANDLUND. 

